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37. Examining the figure, we see that
a
→
+
b
→
c
→
=
0,
where
a
→
⊥
b
→
.
(a)

a
→
×
b
→

=
(3.0)(4.0)
= 12 since the angle between them is 90º.
(b) Using the Right Hand Rule, the vector
ab
×
G
G
points in the
ˆˆ ˆ
ijk
×=
, or the +
z
direction.
(c) 
a
→
×
c
→
 = 
a
→
×
(
−
a
→
−
b
→
) = 
− (
a
→
×
b
→
) =
12.
(d) The vector
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 Spring '08
 Any
 Physics

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